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Are you feeding them any nutes at all? And if so what kind, what strength and how often?

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If you have them in the same pot for 5 weeks without feeding them they're defo short of dome nutes. If there are roots poking through the drain holes then you might also have to pot them up. Root bounding also causes nute lock-out. Be careful with ferts though, use only small amounts. There's a guide somewhere that explains how to use a variety of fertilizers without burning your plants to bits.

According to other posts it's likely to be either overwatering or excessive nitrogen. They're in ji #2 so surely shouldn't definitely need nutes? Plus they're in 10lt pots, presumably they'll never need re-potting?

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Temps can touch 30, but seem to hover around 27ish lights on, then around 18-20 lights off.

Watering every, roughly, 4 days. The last watering was Saturday morning! About 1.3l went in, maybe a touch more. I'm thinking that was too much, but if it was watering then surely she would have recovered slightly by now. Actually, looking back over my notes, this was starting to happen before I watered....

I tried a soil pH test, but I don't think I did it very well. It came out around 7-7.5 by the chart, but will do it properly tomorrow.

If pH is that high, could that be the cause ? There doesn't seem to be anything else wrong, and how come the other plant is seemingly fine ? I've not done anything differently to either of them.

If the ph is 7.5 then yes that could be your problem, need to get an accurate read really mate...

All plants are different, some react diff mate.

You can use ph up + down to adjust the ph.... if your ph is too high or low, it stops the plant from taking up certain nutrients and that COULD be the problem.
though the other plant seems fine, so it might not be that...

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